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    <script>
      // 计算[2, 6, 18, 15, 40] 中能被3整除的偶数的个数
      // 计算[2, 6, 18, 15, 40] 中能被3整除的偶数的和
      let arr = [2, 6, 18, 15, 40]
      let newArr = []
      for (let i = 0; i < arr.length; i++) {
        if (arr[i] % 3 === 0 && arr[i] % 2 === 0) newArr.push(arr[i])
      }

      document.write(`能被3整除的偶数的个数${newArr.length}`)
    </script>
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